The interaction between the gun system and projectile cannot be directly measured during the launch event, leaving the interaction to be inferred from the exit state conditions of the projectile through various recording devices. The only direct means of studying the in-bore motion of the projectile and projectile-gun system interaction is through numerical simulation. The best approach for validation of the Army Research Laboratory's (ARL) gun-projectile dynamic simulation codes is comparison with projectile motion data obtained from ARL ballistic jump test experiments. In such tests, four or more sets of orthogonal radiograph images (x-rays) are typically used to characterize the state of the projectile at muzzle exit. The results from the x-rays can be directly compared to the predictions made by the gun-projectile dynamic simulations. This paper describes the methodology used to compare recent jump test data to gun-projectile dynamic simulations and presents comparisons for seven 120 mm prototype kinetic (KE) energy projectiles. The projectiles contain significant differences in their charge, subprojectile, and sabot designs that span the design parameters encountered in cartridge development.